Jelly Proxy
NB: Heavily inspired by jellyproxy.js in the Jellyfish project - hopefully can oneday be used in that project.
Jelly Proxy is a proxy server that allows you to inject a payload onto html pages, allowing you to insert test monitoring code etc.
API:
npm install jelly-proxy
var jp = ; var opts = tag : "</head>" // Default: </body> payload : fs var { // This function is called for urls prefixed with _jelly}